DENVER Records containing personal information on more than 150-thousand Denver voters are missing at city elections offices.

Officials are trying to figure out if the files were lost, stolen or simply moved.The Denver Election Commission is also trying to figure our why officials didn't learn the records were missing for nearly four months.The microfilmed voter registration files from 1989 to 1998 were in a 500-pound cabinet that disappeared when the commission moved to new offices in February.

The files contain voters' Social Security numbers, addresses and other personal information.Also missing is a box with cards signed by voters who cast early ballots. The cards contain names, birth dates, addresses and partial Social Security numbers.